Double half-back sofa



FIG. 1 is a front perspective view of a double half-back sofa, showing my new design;

FIG. 2 is a first front elevational view thereof;

FIG. 3 is a second front elevational view thereof, taken from the opposite side of FIG. 2;

FIG. 4 is a top plan view thereof;

FIG. 5 is a side view thereof taken from the left of FIG. 4, the end view opposite that shown in FIG. 5 being the mirror image thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a double half-back sofa, as shown and described. 